t/cindex*: require SCM_RIGHTS for these tests

Code search will require SCM_RIGHTS, and Inline::C on BSDs
probably isn't too onerous a dependency for new features as
all the ones I've tested have it packaged.

Furthermore, requiring SCM_RIGHTS isn't far off since OpenBSD's
Perl is patched to route the `syscall' perlop through libc[1],
while NetBSD[2] and FreeBSD[3] actually do strive for backwards
compatibility.  We'd just need to use the numbers and not rely
on syscall.ph shipped with Perl since the macro names themselves
are unstable.

[1] https://cvsweb.openbsd.org/src/gnu/usr.bin/perl/gen_syscall_emulator.pl
[2] https://www.netbsd.org/docs/internals/en/chap-processes.html#syscall_versioning
[3] https://wiki.freebsd.org/AddingSyscalls#Backward_compatibily

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